[removed] constant properties

Question

In javascript, can I declare properties of an object to be constant?

Here is an example object:

   var XU = {
      Cc: Components.classes
   };
<         


        

Answer 1

To define a constant property, you could set the writable attribute to false in the defineProperty method as shown below:

Code snippet:

var XU = {};

Object.defineProperty(XU, 'Cc', {
    value: 5,
    writable: false
});

XU.Cc = 345;

console.log(XU.Cc);

Result:

5           # The value hasn't changed